模糊综合评判在桥梁横向抗震研究中的应用

Generally speaking，for an ordinary highway and railway simply supported girder bridge, the structure of the lateral stiffness is more greatly than longitudinal stiffness, so it does not control the design of transverse bridge.Therefore, we paid more attention to longitudinal earthquake than to transverse earthquake in the past seismic design. The seismic damage in recenty years indicates that it should pay enough attention to the transverse earthquake. It is necessary to research deep on transverse earthquake thus clarify the basie reason causing the bridge to destroy under transvers eearthquake .Based on the results of previous transverse earthquake ,this paper uses the fuzzy synthesis evaluation based on the fuzzy theory to study the seismic isolation of transverse bridge.The basic reason causing the bridge to destroy under transverse earthquake,such as seismic site，intensity，link stiffness of LRB，and bridge structures themselves are considered.Then construct the evaluation matrix of the single factor.Finally,the evaluation result of the transverse bridge is drawed through the model of the multi-level fuzzy synthesis evaluation.